Following UN Article, rebel saw Assembly as impossible to argue against (12)

I believe the answer is:

unanswerable

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'impossible to argue against' is the definition.
I can't judge whether this defines the answer.

'following un article rebel saw assembly' is the wordplay.
'following' is a charade indicator (letters next to each other).
'article' becomes 'an' (English indefinite article).
'assembly' indicates anagramming the letters.
'rebel'+'saw'='rebelsaw'
'rebelsaw' with letters rearranged gives 'swerable'.
'un'+'an' is 'unan'.
'unan'+'swerable'='UNANSWERABLE'

'as' acts as a link.

Can you help me to learn more?

(Another definition for unanswerable that I've seen is " Irrefutable".)

I've seen this clue in The Independent.

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